c^6-N+25d²=(c^3-5d)²
c^6-N+25d²=c^6-10c³d+25d²
c^6-N+25d²-c^6+10c³d-25d²=0
-N+10c³d=0
-N=-10c³d
N=10c³d
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c^6-N+25d²=(c^3-5d)²
c^6-N+25d²=c^6-10c³d+25d²
c^6-N+25d²-c^6+10c³d-25d²=0
-N+10c³d=0
-N=-10c³d
N=10c³d